SA7496L

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

REV:1.2

2006.12.31

Http: www.silan.com.cn

Page 4 of 10

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Pin No.

Pin name

Description

4

INL

Left input

5

VAROUT_L

Left output_1

6

VOLUME

Volume control

7

VAROUT_R

Left output_2

8

NC

Not connect

9

INR

Right input

10

SVR

Supply voltage rejection

11

STBY

Stand by pin

12

MUTE

MUTE pin

13

GND

Ground

14

OUTR

Right output

15

Supply voltage

16

Supply voltage

17

OUTL

Left output

18

GND

Ground

19

GND

Ground

20

GND

Ground

FUNCTION DESCRIPTION

The SA7496L is a semiconductor integrated circuit consisting of two channel power amplifiers, which is a

stereo class AB power amplifier, specially designed for high quality sound, TV applications, which include linear

volume control, stand-by and mute functions.

There are the MUTE and STAND-BY turn on and off conversion circuit in order to eliminate the plops noise.

When the both voltages are low and the operation will be normal. While the STAND-BY is high, the circuit will

turn off the bias current, so it will be the stand-by state. Also when the STAND-BY is low and the MUTE is high,

the circuit will be the mute state, in this operation, the bias current of the signal channels will be shutdown.

The SA7469L built-in a DC volume control circuit. While the voltage of pin6 is 0, the output voltage will be 0;

and the gain will be increased as the pin6’

s voltages go up.

In this circuit, as the operation temperature’

s increase, the transistor’

s threshold limit value will decrease, when

the temperature up to 150

°C, the thermal protection circuit will turn on and the signal channel will be shutdown.

MUTE & STAND-BY TRUTH TABLE

MUTE

ST-BY

Operating State

H

H

STANDBY

L

H

STANDBY

H

L

MUTE

L

L

PLAY

Note: “H”denotes the voltage is larger than 3.5V, and “L”denotes the voltage is lower than 1.5V.